Method of making resilient mountings for machines



April 4, 1939. D. F. NEWMAN METHOD OF MAKING RES'ILIENT MOUNTINGS FOB MACHINES Original F'iled- Dec. 18, 1956 Inventor. Delbert 1Q. Newman, by'WH/fyx/MM l vAttorrwey.

- Patented Apr. 4, 1939 n METHOD OF MAKING RESILIENT MOUNT- INGS FOR MACHINES Delbert F. Newman, Schenectady, N. Y., assgnor to General Electric Company, a corporation of New York Original application December 18, 1936, Serial No. 116,586. Divided and this application June 12, 1937, Serial No. 147,947

7 Claims. (Cl. 29-150) My invention relates to a method of making resilient mountings for machines, such as the motor-compressor units of refrigerating machines. A resilient mounting of this construc- 5 tion isdescribed and claimed in my copending application Serial No. 116,586, filed December 18, 1936, of which this application is a division, both applications being assigned to the General Electric Company.

l In many refrigerating machines and, particularly in those designed for domestic use, a cabinet is provided. having a food storage compartment therein. The machine also includes a motorcompressor unit for compressing gaseous refrig- 15 erant. The compressed refrigerant is liqueed by a suitable condenser and is supplied to an expension type cooling unit located in the food 'storage compartment ci the cabinet. In order to provide a self-contained refrigerating machine,

20 it is desirablethat the motor-compressor unit be enclosed in a casing and that this casing together with the condenser be mounted on the cabinet. The motor-compressor unit is resiliently mounted on a series of helical springs secured to the base 25 of the enclosing casing in order to minimize the transmission of vibration from the motor-compressor unit to the cabinet.

It is an object of my invention to provide an improved method of making resilient mountings 30 for machines, such as the motor-compressor units of refrigerating machines which lends itself particularly to quantity production.

Further objects and advantages of my invention will become apparent as the following de- 35 scription proceeds, and thefeatures of novelty which characterize my invention will be pointed out with particularity inthe claims annexed to and forming a. part of this specification.

For a better understanding of my invention,

40 reference may be had to the accompanying drawing in which Fig. 1 is a front elevation of a portion of a refrigerating machine having a motorcompressor unit supported upon a resilient mounting which is made in accordance with my 45 invention; Fig. 2 is an exploded view of the resilient mounting shown in Fig. 1, showing the same in an initial stage of construction; Fig. 3 is a vertical sectional view of the resilient mounting shown in Fig. 1; and Fig. 4 is a bottom view along 50 the line 4-4 of the resilient mounting shown in Fig. 3.

Referring to the drawing, in Fig. 1 I have shown a portion of a refrigerating machine mounted on a removable top wallof a cabinet, which is shown having a metal outer shell I0 and a sheet metal inner liner II of a food storage compartment I2 in the cabinet. The outer shell I0 and the inner liner I I are separated by a layer of heat insulating material I3. The food storage compartment I2 formed in the cabinet is cooled by an evaporator I4 suspended beneath the top wall and supplied with liquid refrigerant from an air-cooled condenser I5 through a conduit I6 and a flow controlling float valve I1. The liquid refrigerant supplied to the evaporator I4 is vaporized by the absorption of heat from articles contained in the food storage compartment I2 and the vaporized refrigerant is withdrawn therefrom through a suction conduit I8 communicating with the interior of an hermetically-sealed casing I9 so that this casing is subjected to the low pressure maintained in the evaporator. The gaseous refrigerant in the casing I9 is compressed by motorcompressor unit 20 and discharged through a conduit 2l to the air-cooled condenser I5.

'I'he motor-compressor unit 20 is resiliently mounted on a series of spaced helical springs 22 secured to the bottom wall or base 23 of the casing I9 to allow the motor-compressor unit to move on the springs with respect to the casing I9, thus preventing the transmission of vibration from the motor-compressor unit to the cabinet. One end of each of the springs 22 is securely fastened to a threaded boss 24 welded or otherwise rigidly attached to the wall 23 While the other end of the spring is securely fastened to a bracket 25 rigidly attached to the motor-compressor unit 20, as best shown in Figs. 3 and 4. The bracket 25 comprises a unitary structure formed of sheet metal and includes a body 2B and an integral stem 21. The body 26 is substantially U-shaped, having legs 28 ared outwardly in opposite directions and rigidly attached to the motor-compressor unit 20 preferably by the fusion of metal such, for example, as spot welding or the like. The stem A21 is shaped substantially in the form of a split cylinder and is provided with a number of indentations 29 in its inner surface constituting threads clamping and securely fastening the coils of the spring 22 thereto. On each side of the bracket 25 are provided slots 30 disposed between the outwardly ared legs 28 of the body 26 and the curved ends of the stem 21 to allow the upper end of the spring 22 to be resiliently gripped and securely fastened to the threaded stem 21.

In making the resilient mounting described above, a sheet metal bracketblank 25 comprising a body portion 26 and a stem portion 2I,A having a number of angularly disposed indentations 29 therein adapted .to register in the completed u bracket to provide threads suitable to receive the coils ofthe spring 22, is formed as shown in Fig. '2. The body and stem portions of the blank are then bent into a substantially U-shaped bracket, the

legs 28 of the body 26 being ared outwardly in 1 compressor unit in equally spaced relation to cor respond to the spacing of the springs 22 about the base of the casing I9 and the legs 2B thereof are welded to the motor compressor unit. The lower end of each of a plurality of springs 22 is securely fastened to one of the threaded bosses 2l spaced about the base 23 of the casing i9. The motor-compressor unit having the brackets attached thereto is then placed into the casing!! in superposed relationship with respect to the ends of the upstanding springs 22. The upper end of each of the springs 221s placed between the'substantially parallel extending ends -of the stem portion 21 of one of the brackets 25 substantially the shape of a split cylinder bringing the indentation 29 into registry and threaded engagement with the coils of the spring 22.

While I have shown my invention as applied to the making of resilient mountings for the motor-compressor units of refrigerating machines designed for domestic use, I do not desire my invention to be limited to the particular method shown and described, and I intend in the appended claims-to cover all modifications within the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A method of making a resilient mounting comprising a helical supporting spring and a unitary sheet metal bracket which includes forming the legs of said U-shaped stern portion in registry with said fastening means, and bending the outer ends of the legs of said U-shaped stem portion into engagement with the coils of said spring. l,

2. A method of making a resilient mounting comprising a helical supporting spring and a unitary sheet metal bracket which includes forming a sheet metal bracket blank provided with a body portion and a stem portion, providing on the inner surface of said stem portion fastening means for engaging said spring, bending the stem portion of said blank into a substantially U--shape, placing the coils of said spring in the bottom of said U of said stem portion in registry With said fastening means, and bending the outer ends of the legs of said U-shaped stem portion into engagement with the coils of said spring.

3. A method of making a resilient mounting comprising a helical supporting spring and a unitary sheet metal bracket whichincludesforming a sheet metal bracket blank provided with a body portion and a stem portion, providing on the inner surfcae of said stem portion fastening means for engaging said spring, bending the stem portion of said blank into a substantially U-shape, placing the coils adjacent the upper end of said spring between the legs of said U-shaped stem portion in registry with said fastening means, and bending the outer ends of the legs of said U-shaped stem portion into engagement with the coils of said spring to enclose `the upper end of said spring.

4. A method of making a resilient mounting comprising a helical supporting spring and a unitary sheet metal bracket which includes forming a sheet metal bracket blank provided with a body portion and a stem portion having indentations therein adapted to engage adjacent coils of said outer ends of the legs of said U-shape stem portion to bring said indentations into engagement with adjacent coils of said spring.

5. A method of making a resilient mounting comprising a helical supporting spring and a unitary sheet metal bracket which includes formingV a sheet metal bracket blank provided with a. body portion and a stem portion having angularly disposed indentations therein adapted to register in the completed bracket to provide threads suitable to receive the coils of said spring, bending the stem portion of said blank into a. substantially U-shape, placing the coils of said spring between the legs of said U-shaped stem portion, and bending. the outer ends of the legs of said U-shaped stem portion to bring said indentations into registry and threaded engagement with the coils of said spring.

6. A method of making a resilient mounting for a machine comprising a helical supporting spring and a unitary sheet metal bracket which includes forming a sheet metal bracket blank provided with a body portion and a stem portion, providing on the inner surface of said stem portion fastening means for engaging said spring, bending the body and stem portions of said blank into a substantially U-shaped bracket, securing the legs of said U-shaped body portion to the machine, placing the coils of said spring betwen the legs of said U-shaped stem portion in registry with said fastening means, and bending the outer ends of the legs of said U-shaped stem portion into engagement with the coils of said spring.

7. A method of making a resilient mounting for a machine comprising a helical supporting spring and a unitary sheet metal bracket which includes forming a sheet metal bracket blank provided with a body portion and a stem portion having angularly disposed indentations therein adapted to register in the completed bracket to provide threads suitable to receive the coils of said spring, bending the body and stem portions of said blank into a substantially U-shapedbracket, securing the legs of said U-shaped body portion to the machine, placing the coils of said spring between the legs of said U-shaped stem portion, and bending the outer ends of the legs of said U-shaped stem portion to bring said indentations into registry and threaded engagement with the coils of said spring.

DELBERT F. NEWMAN. 

